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Old 05-17-2011, 12:28 PM
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Default How to demagnetize metal

Anyone have an idea how to build a demagnetizer? I have a saw I'm trying to sharpen and all the filings are sticking to a section of it which makes it really tough to work with.
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Old 05-17-2011, 12:39 PM
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Google "degaussing coil"

http://www.kerrywong.com/2010/01/18/...gaussing-coil/

http://wiki.answers.com/Q/How_can_yo...a_demagnetizer
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Old 05-17-2011, 12:42 PM
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Drop it a few times if you can.

Some other ideas - I bet the Black Hole down in Los Alamos had something that would work for this purpose - too bad I'm not taking a trip down there anytime soon.
http://www.groupsrv.com/hobby/about188239.html
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Old 05-18-2011, 09:33 AM
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Thanks for the info guys. Do you think a bulk tape degausser would be strong enough to demagnetize a sheet of steel? I found several on FleaBay cheap.
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Old 05-18-2011, 09:50 AM
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What kind of steel is it and how thick? A tape eraser probably won't be very strong, so my guess is no. How much are they going for on eBay? If it was me, I'd buy a 500-foot spool of 24AWG magnet wire and wind a monster one. Can't imagine a spool would be more than $20~$40. Other than a huge coil, a degausser is a switch and a plug. I would also put a 100W bulb in series (while you can still get them) to limit the current a little.
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Old 05-18-2011, 09:52 AM
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If you could something like this used:

http://www1.mscdirect.com/CGI/NNSRIT...MTERM=09041500

It'd probably work much better.
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Old 05-18-2011, 09:54 AM
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Bruce's link is to an industrial version of exactly what you need. It's $150.

That buys A LOT of magnet wire...

http://bbs.homeshopmachinist.net/showthread.php?t=47853

If you want to experiment, I have a Variac you can use.
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Old 05-18-2011, 01:47 PM
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Heat it up to cherry glowing red
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Old 05-18-2011, 08:24 PM
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A coil of wire is the way to do it. The 100W lamp in series is also a plus. I dont know that the wire (depending on the length) would have enough resistance to keep a breaker from tripping. I would go with that one. Finding the wire is another story, since all copper and precious metals are ending up in a scrap yard. Even metal in use is getting ripped out by thieves these days.
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Old 05-19-2011, 10:03 AM
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How about the least expensive option to just buy a new saw blade?
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